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Diazoketone linkers −COCN2– connect two N,N′-bis(2,2,2-trifluorethyl)rhodamine residues via positions 5′ and 6′ of the pendant phenyl rings: four possible regioisomers 1a–d and their designations Iso4, Iso3, Iso1, and Iso2 (for isomers 1–4, respectively) according to high performance liquid chromatography (HPLC) retention times.
